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• Change pitch of audio file without altering the duration of audio file (FFMPEG)

  13 janvier 2016, par VickyS

  I am in a bit of trouble.
  I am working on FFMPEG for android and now my task is to modify the pitch of the audio file without altering the duration of the audio file.

  I used these commands but they alter the duration :

  ffmpeg -i /sdcard/emoj/final.wav -filter:a atempo=1.5 -vn /sdcard/emoj/final1.wav
  
  
  
  ffmpeg -i /sdcard/emoj/final.wav -filter:a asetrate=r=35K -vn /sdcard/emoj/final1.wav

  I know I can use Sonic NDK for this purpose. But I want to know if its possible with the help of FFMPEG.
  In documentation I have seend something called "Rubberband" I think that can help. But I dont know how to use that.

  I just want the command to do that.
  I would appreciate any help in this regard.

• How to trim and merge using Fluent FFMpeg ?

  29 juillet 2016, par John D.

  Here’s what I want to do with fluent-ffmpeg :

  I have 3 input files. An intro, main, and outro video. I wish to merge the three, while trimming the main video. Here is my code :

  var ffmpegCommand = ffmpeg();
  
  ffmpegCommand.addInput(introVideo);
  
  ffmpegCommand.addInput(mainVideo).seekInput(20).duration(3);
  
  ffmpegCommand.addInput(outroVideo);
  
  ffmpegCommand.on('error', function(err, stdout, stderr){
  
    console.log("FAILED!\n\t"+err+"\n\t"+stdout+"\n\t"+stderr);
  
  });
  
  ffmpegCommand.on('end', function(){
  
    console.log('COMPLETE!');
  
  });
  
  ffmpegCommand.on('start', function(commandLine) {
  
    console.log('Spawned Ffmpeg with command: ' + commandLine);
  
  });
  
  ffmpegCommand.mergeToFile('final.mp4', './vid_files/tmp');

  The program executes fine, but when I ffplay final.mp4, the result is that introVideo plays then the video appears to freeze. According to the fluent-ffmpeg documentation, it states "Each of these [Input options] methods apply on the last input added". So I can’t figure out why that syntax doesn’t seem to work...

  How can I trim the main video to send to mergeToFile ?

  Note that this works fine if I don’t have .seekinput(20).duration(3) on the second addInput.

  Oh, here’s the outputted commandLine value :

  ffmpeg -i ./vid_files/intro.mp4 -ss 20 -i ./vid_files/main.mp4 -i ./vid_files/outro.mp4 -y -filter_complex concat=n=3:v=1:a=1 -t 3 final.mp4

• Can't write video using moviepy. output format error

  23 décembre 2022, par Ronnie Kisor

  I'm trying to concatenate videos in each folder so that I get one video in each folder instead of multiple short ones. This is an external USB drive if that matters.

  


  My code seems to iterate over the files as expected, but I keep getting this error after the audio is written, during the "writing video" action, I believe : b"[NULL @ 000002a8340ae640] Unable to find a suitable output format for 'D:\\taxes\\folder\\test'\r\nD:\\taxes\\folder\\test: Invalid argument\r\n"

  


  I haven't found a way to force an output format yet. Any thoughts ?

  


  import os
from moviepy.editor import *

startingDir = r'D:\taxes'

avoid = ['0incomplete', 'old', 'that', 'this']

for thing in os.listdir(startingDir):
    clips = []
    name = ''
    
    if thing in avoid:
        print('                              avoided {}'.format(thing))
        continue

    folder = os.path.join(startingDir, thing)

    if os.path.isdir(folder):
        for clip in os.listdir(folder):
            print (clip)
            clips.append(VideoFileClip(os.path.join(folder, clip)))
        print('\n')

        try:
            final = concatenate_videoclips(clips)
            final.write_videofile(os.path.join(folder, 'test'), audio=True, codec='libx264', threads=10)
            final.close() 
        except Exception as e:
            print (e)
            print('\n Continuing... \n\n')
            continue